<template>
    <div>
      <!-- 面包屑组件-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域 -->
      <el-card>
        <el-row>
          <el-col>
            <el-button type="primary" @click="showAddCateDialog">添加分类</el-button>
          </el-col>
        </el-row>
      <!--树形表格 -->
        <tree-table :data="cateList" :columns="columns" :selection-type="false"
                    :expand-type="false" show-index index-text="#" border class="tree-table">
          <!--作用域插槽：是否有效-->
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted == false" style="color: lightgreen"></i>
            <i class="el-icon-error" v-else style="color: darkred"></i>
          </template>
          <!--排序 -->
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
            <el-tag type="success" size="mini" v-if="scope.row.cat_level === 2">二级</el-tag>
            <el-tag type="warning" size="mini" v-if="scope.row.cat_level === 3">三级</el-tag>
          </template>
          <!--操作 -->
          <template slot="opt" slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini"
                       @click="showCateDialog(scope.row.cat_id)">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini"
            @click="removeCateById(scope.row.cat_id)">删除</el-button>
          </template>
        </tree-table>

      <!--分页区域 -->
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3,5,10,15]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
        </el-pagination>
      </el-card>

      <!--添加分类对话框 -->
      <el-dialog
        title="添加分类"
        :visible.sync="addCatDialogVisible"
        width="50%"
        @close="addCateDialogClosed">
        <!--表单 -->
        <el-form :model="addCateForm" :rules="addCateRules" ref="addCateFormRef"
                 label-width="100px" class="demo-ruleForm">
          <el-form-item label="分类名称:" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类:">
            <el-cascader
              v-model="selectedKeys"
              :options="parentCateList"
              :props="{expandTrigger: 'hover', value:'cat_id', label:'cat_name', children:'children'}"
              @change="parentCateChanged"></el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addCatDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addCat">确 定</el-button>
  </span>
      </el-dialog>

      <!--编辑商品分类对话框 -->
      <el-dialog
        title="修改分类"
        :visible.sync="editCateDialogVisible"
        width="50%"
        @close="editCateDialogClosed">

        <el-form :model="editCateForm" :rules="editCateFormRules" ref="editCateFormRef" label-width="70px">
          <el-form-item label="分类名称">
            <el-input v-model="editCateForm.cat_name"></el-input>
          </el-form-item>
        </el-form>

        <span slot="footer" class="dialog-footer">
		    <el-button @click="editCateDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="editCateInfo">确 定</el-button>
		  </span>
      </el-dialog>

    </div>
</template>

<script>
    export default {
        name: "Cate",
      data(){
          return {
            //查询条件
            queryInfo: {
              type: 3,
              pagenum: 1,
              pagesize: 5
            },
            //商品分类列表
          cateList: [],
            total: 0,
            //为树形表格指定列的属性
            columns: [{
              label: '分类名称',
              prop: 'cat_name'
            },{
              label: '是否有效',
              //表示将当前列定义为模板列
              type: 'template',
              template: 'isok'
            },{
              label: '排序',
              type: 'template',
              template: 'order'
            },{
              label: '操作',
              type: 'template',
              template: 'opt'
            }],
            addCatDialogVisible: false,
            //添加分类的数据表单对象
            addCateForm: {
              cat_pid: 0,
              cat_name: '',
              cat_level: 0
            },
            addCateRules:{
              cat_name: [{required: true, message: '请输入分类名称', trigger: 'blur'}]

            },

            //父级分类列表
            parentCateList: [],
            //选择的父级分类的id数组
            selectedKeys: [],

            editCateDialogVisible: false,
            editCateForm: {},
            editCateFormRules: {
             cat_name: [ {required: true, message: '请输入分类名称', trigger: 'blur'}]
            }
          }
      },
      created() {
          this.getCateList();
      },
      methods: {
        async getCateList(){
          const {data: res} = await this.$http.get('/categories',{params: this.queryInfo})
          if(res.meta.status !== 200){
            return this.$message.error('获取商品分类失败！')
          }
          this.cateList = res.data.result
          this.total = res.data.total
        },
        //监听pagesize改变事件
        handleSizeChange(newpageSize) {
          this.queryInfo.pagesize = newpageSize
          this.getCateList()
        },
        handleCurrentChange(newpageNum) {
          this.queryInfo.pagenum = newpageNum
          this.getCateList()
        },

        showAddCateDialog() {
          //先获取父级分类的数据列表
          this.getParentCatList()
          this.addCatDialogVisible = true
        },
        //获取父级分类的数据列表
        async getParentCatList() {
          const {data: res} = await this.$http.get('categories',{params: {type: 2}})
          if(res.meta.status !== 200){
            return this.$message.error('获取父级分类数据失败！')
          }
          //console.log(res.data)
          this.parentCateList = res.data
        },
        //选择项变化时触发此函数
        parentCateChanged() {
          //console.log(this.selectedKeys)
          //如果selectedKeys中的length值大于0，证明选中了父级分类
          if(this.selectedKeys.length > 0){
            //父级分类的最后个id
            this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length-1]
            this.addCateForm.cat_level = this.selectedKeys.length
            return
          }else{
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0

          }

        },
        addCat() {
          //console.log(this.addCateForm)
          this.$refs.addCateFormRef.validate(async valid => {
            if(!valid) return
            const{data: res} = await  this.$http.post('categories',this.addCateForm)
            if(res.meta.status !== 201){
              return this.$message.error('添加分类失败！')
            }
            this.$message.success('添加分类成功！')
            this.getCateList()
            this.addCatDialogVisible = false

          })
        },
        //监听对话框关闭事件，重置表单
        addCateDialogClosed() {
          this.$refs.addCateFormRef.resetFields();
          this.selectedKeys = [];
          this.addCateForm.cat_level = 0;
          this.addCateForm.cat_pid = 0

        },
        //根据id查询分类
        async showCateDialog(id) {
          //console.log(id)
          this.editCateDialogVisible = true
          const {data: res} = await this.$http.get('categories/'+id)
          if(res.meta.status !== 200){
            return this.$message.error("查询分类失败！")
          }
          this.editCateForm = res.data
          this.editCateDialogVisible = true


        },
        editCateInfo(){
          this.$refs.editCateFormRef.validate(async valid =>{
            //console.log(valid)
            if(!valid) return
            //发起网络请求，修改数据
            const {data: res} = await this.$http.put('categories/'+this.editCateForm.cat_id,{
              cat_name: this.editCateForm.cat_name
            })
            if(res.meta.status !== 200){
              return this.$message.error("修改分类失败！")
            }
            this.editCateDialogVisible = false
            this.getCateList()
            this.$message.success("修改分类成功！")
          })
        },
        //删除分类
        async removeCateById(id) {
          //弹框提示是否删除
          const confirmCateResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).catch(err => err)
          //如果用户确认删除 返回confirm
          //如果用户取消删除 返回cancle
          //console.log(confirmCateResult)
          if(confirmCateResult !== 'confirm'){
            return this.$message.info("已取消删除！")
          }
          const {data: res} = await this.$http.delete('categories/'+id)
          if(res.meta.status !== 200){
            return this.$message.error("删除分类失败！")
          }
          this.getCateList()
          this.$message.success("删除分类成功！")
        },

        editCateDialogClosed() {
          this.addCatDialogVisible = false
          this.getCateList()

        }
      },
    }
</script>

<style lang="less" scoped>
.tree-table{
  margin-top: 10px;
}
  .el-cascader {
    width: 100%
  }
</style>
